What is the furthest distance from the computer room to the optical distribution box

For standard structured cabling, the maximum horizontal distance is 90 meters (295 feet), while optical distribution networks can extend up to 20 kilometers or more.Horizontal Cabling (Copper or Short Fiber Links)In typical building network design, the telecommunications room (computer room) connects to work areas or optical distribution boxes via horizontal cabling. According to ANSI/TIA-568 standards, the maximum horizontal cable length is 90 meters (295 feet) regardless of the cable type, including UTP or multimode fiber used for short-distance connections . This distance includes the permanent link from the telecommunications room to the outlet but excludes patch cords at either end. Exceeding this limit can result in signal degradation, reduced bandwidth, and non-compliance with structured cabling standards.Optical Distribution Network (Fiber)For fiber optic networks, particularly in Passive Optical Network (PON) systems, the distance from the optical line terminal (OLT) in the computer room to the optical distribution box can be much longer. The feeder fiber segment of the ODN can reach 20 kilometers or more, depending on the fiber type, split ratio, and optical power budget . This allows a single OLT to serve multiple distribution points across a wide area, far exceeding the 90-meter limit of copper horizontal cabling.Practical ConsiderationsBuilding Design: Place telecommunications rooms centrally on each floor to minimize horizontal cable lengths and stay within the 90-meter limit .Fiber Deployment: Use fiber for longer distances between the computer room and optical distribution boxes, especially in campus or multi-building environments .Patch Panels and Splitters: Ensure proper termination and optical splitters are used to maintain signal quality over long distances.Standards Compliance: Follow TIA/EIA-568 and TIA-607 guidelines for grounding, bonding, and cable management to ensure reliability . In summary, for standard horizontal cabling, the furthest distance is 90 meters, while for fiber-based optical distribution networks, distances can extend up to 20 km or more, depending on system design and optical power budget.